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# SPDX-License-Identifier: LGPL-2.1+
# Ripped from systemd: https://github.com/systemd/systemd/pull/20429
if not enable_clat
subdir_done()
endif
bpf_compiler = get_option('bpf-compiler')
clang_found = false
clang_supports_bpf = false
bpf_gcc_found = false
bpftool_strip = false
if bpf_compiler == 'clang' or bpf_compiler == 'auto'
# Support 'versioned' clang/llvm-strip binaries, as seen on Debian/Ubuntu
# (like clang-10/llvm-strip-10)
if meson.is_cross_build() or cc.get_id() != 'clang' or cc.cmd_array()[0].contains('afl-clang') or cc.cmd_array()[0].contains('hfuzz-clang')
r = find_program('clang',
version : '>= 10.0.0')
clang_found = r.found()
if clang_found
if meson.version().version_compare('>= 0.55')
clang = r.full_path()
else
clang = r.path()
endif
endif
else
clang_found = true
clang = cc.cmd_array()
endif
if clang_found
# Check if 'clang -target bpf' is supported.
clang_supports_bpf = run_command(clang, '-target', 'bpf', '--print-supported-cpus', check : false).returncode() == 0
endif
elif bpf_compiler == 'gcc' or bpf_compiler == 'auto'
bpf_gcc = find_program('bpf-gcc',
'bpf-none-gcc',
'bpf-unknown-none-gcc',
version : '>= 13.1.0')
bpf_gcc_found = bpf_gcc.found()
endif
if bpf_compiler == 'auto'
if clang_supports_bpf and bpf_gcc_found
# Both supported, prefer the one matching our compiler:
if cc.get_id() == 'gcc'
bpf_compiler = 'gcc'
else
# Default to clang if we don't know this compiler
bpf_compiler = 'clang'
endif
elif clang_supports_bpf
bpf_compiler = 'clang'
elif bpf_gcc_found
bpf_compiler = 'clang'
endif
endif
if clang_supports_bpf or bpf_gcc_found
# Debian installs this in /usr/sbin/ which is not in $PATH.
# We check for 'bpftool' first, honouring $PATH, and in /usr/sbin/ for Debian.
# We use 'bpftool gen object' subcommand for bpftool strip, it was added by d80b2fcbe0a023619e0fc73112f2a02c2662f6ab (v5.13).
bpftool = find_program('bpftool',
'/usr/sbin/bpftool',
required : bpf_compiler == 'gcc',
version : bpf_compiler == 'gcc' ? '>= 7.0.0' : '>= 5.13.0')
if bpftool.found()
bpftool_strip = true
elif bpf_compiler == 'clang'
# We require the 'bpftool gen skeleton' subcommand, it was added by 985ead416df39d6fe8e89580cc1db6aa273e0175 (v5.6).
bpftool = find_program('bpftool',
'/usr/sbin/bpftool',
required : true,
version : '>= 5.6.0')
endif
# We use `llvm-strip` as a fallback if `bpftool gen object` strip support is not available.
if not bpftool_strip and bpftool.found() and clang_supports_bpf
if not meson.is_cross_build()
llvm_strip_bin = run_command(clang, '--print-prog-name', 'llvm-strip',
check : true).stdout().strip()
else
llvm_strip_bin = 'llvm-strip'
endif
llvm_strip = find_program(llvm_strip_bin,
required : true,
version : '>= 10.0.0')
endif
else
error('clat support was enabled but couldn\'t find a suitable BPF compiler!')
endif
bpf_clang_flags = [
'-std=gnu17',
'-Wunused',
'-Wimplicit-fallthrough',
'-Wno-compare-distinct-pointer-types',
'-fno-stack-protector',
'-O2',
'-target',
'bpf',
'-g',
'-c',
]
bpf_gcc_flags = [
'-std=gnu17',
'-Wunused',
'-Wimplicit-fallthrough',
'-fno-stack-protector',
'-fno-ssa-phiopt',
'-O2',
'-mcpu=v3',
'-mco-re',
'-gbtf',
'-c',
]
clang_arch_flag = '-D__@0@__'.format(host_machine.cpu_family())
libbpf_include_dir = dependency('libbpf').get_variable(pkgconfig : 'includedir')
# Generate defines that are appropriate to tell the compiler what architecture
# we're compiling for. By default we just map meson's cpu_family to __<cpu_family>__.
# This dictionary contains the exceptions where this doesn't work.
#
# C.f. https://mesonbuild.com/Reference-tables.html#cpu-families
# and src/basic/missing_syscall_def.h.
cpu_arch_defines = {
'ppc' : ['-D__powerpc__', '-D__TARGET_ARCH_powerpc'],
'ppc64' : ['-D__powerpc64__', '-D__TARGET_ARCH_powerpc', '-D_CALL_ELF=2'],
'riscv32' : ['-D__riscv', '-D__riscv_xlen=32', '-D__TARGET_ARCH_riscv'],
'riscv64' : ['-D__riscv', '-D__riscv_xlen=64', '-D__TARGET_ARCH_riscv'],
'x86' : ['-D__i386__', '-D__TARGET_ARCH_x86'],
's390x' : ['-D__s390__', '-D__s390x__', '-D__TARGET_ARCH_s390'],
# For arm, assume hardware fp is available.
'arm' : ['-D__arm__', '-D__ARM_PCS_VFP', '-D__TARGET_ARCH_arm'],
'loongarch64' : ['-D__loongarch__', '-D__loongarch_grlen=64', '-D__TARGET_ARCH_loongarch']
}
bpf_arch_flags = cpu_arch_defines.get(host_machine.cpu_family(),
['-D__@0@__'.format(host_machine.cpu_family())])
if bpf_compiler == 'gcc'
bpf_arch_flags += ['-m' + host_machine.endian() + '-endian']
endif
bpf_o_unstripped_cmd = []
if bpf_compiler == 'clang'
bpf_o_unstripped_cmd += [
clang,
bpf_clang_flags,
bpf_arch_flags,
]
elif bpf_compiler == 'gcc'
bpf_o_unstripped_cmd += [
bpf_gcc,
bpf_gcc_flags,
bpf_arch_flags,
]
endif
bpf_o_unstripped_cmd += ['-I.']
if cc.get_id() == 'gcc' or meson.is_cross_build()
if cc.get_id() != 'gcc'
warning('Cross compiler is not gcc. Guessing the target triplet for bpf likely fails.')
endif
target_triplet_cmd = run_command(cc.cmd_array(), '-print-multiarch', check: false)
else
# clang does not support -print-multiarch (D133170) and its -dump-machine
# does not match multiarch. Query gcc instead.
target_triplet_cmd = run_command('gcc', '-print-multiarch', check: false)
endif
if target_triplet_cmd.returncode() == 0
target_triplet = target_triplet_cmd.stdout().strip()
bpf_o_unstripped_cmd += [
'-isystem',
'/usr/include/@0@'.format(target_triplet)
]
endif
bpf_o_unstripped_cmd += [
'-idirafter',
libbpf_include_dir,
'@INPUT@',
'-o',
'@OUTPUT@'
]
if bpftool_strip
bpf_o_cmd = [
bpftool,
'gen',
'object',
'@OUTPUT@',
'@INPUT@'
]
elif bpf_compiler == 'clang'
bpf_o_cmd = [
llvm_strip,
'-g',
'@INPUT@',
'-o',
'@OUTPUT@'
]
endif
skel_h_cmd = [
bpftool,
'g',
's',
'@INPUT@'
]
clat_bpf_o_unstripped = custom_target(
'clat.bpf.unstripped.o',
input : 'clat.bpf.c',
output : 'clat.bpf.unstripped.o',
command : bpf_o_unstripped_cmd)
clat_bpf_o = custom_target(
'clat.bpf.o',
input : clat_bpf_o_unstripped,
output : 'clat.bpf.o',
command : bpf_o_cmd)
clat_skel_h = custom_target(
'clat.skel.h',
input : clat_bpf_o,
output : 'clat.skel.h',
command : skel_h_cmd,
capture : true)
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